Test example of GRASS GUI plugin for drawing point with high update rate

g.gui.drawing

dummy file just to have nice name on gist

g.gui.draw.html

<h2>DESCRIPTION</h2>


<h2>REFERENCES</h2>


<h2>SEE ALSO</h2>

<h2>AUTHOR</h2>
Anna Petrasova, <a href="http://geospatial.ncsu.edu/osgeorel/">NCSU OSGeoREL</a>,<br>
Vaclav Petras, <a href="http://geospatial.ncsu.edu/osgeorel/">NCSU OSGeoREL</a>
<p>
<i>Last changed: Date: 2016-02-21</i>

g.gui.draw.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import wx
from random import uniform
import grass.script as gscript


class TestPlugin(wx.Dialog):
    def __init__(self, giface, parent):
        wx.Dialog.__init__(self, parent, title="Plugin", style=wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER)
        self.giface = giface
        self.parent = parent

        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.update, self.timer)

        self.toggleBtn = wx.Button(self, wx.ID_ANY, "Start")
        self.toggleBtn.Bind(wx.EVT_BUTTON, self.onToggle)

        self.region = gscript.region()

        self.mapwindow = giface.GetMapWindow()
        self.points = self.mapwindow.RegisterGraphicsToDraw(
                        graphicsType='point', pdc=self.mapwindow.pdcTmp,
                        mapCoords=True)
        color = (255, 0, 0)
        self.points.AddPen('pen1', wx.Pen(colour=color, width=2, style=wx.SOLID))
        #self.points.AddBrush('brush1', wx.Brush(colour=color, style=wx.SOLID))

    def onToggle(self, event):
        btnLabel = self.toggleBtn.GetLabel()
        if btnLabel == "Start":
            print "starting timer..."
            self.timer.Start(100)
            self.toggleBtn.SetLabel("Stop")
            item = self.points.AddItem(coords=[(self.region['w'] + self.region['e'])/2.,
                                               (self.region['n'] + self.region['s'])/2.])
            item.SetPropertyVal('penName', 'pen1')
        else:
            print "timer stopped!"
            self.timer.Stop()
            self.toggleBtn.SetLabel("Start")
            self.points.DeleteItem(self.points.GetItem(0))

        self.points.Draw()
        self.mapwindow.UpdateMap(render=False)

    def update(self, event):
        point = self.points.GetItem(0)
        x, y = point.GetCoords()
        move = (self.region['n'] - self.region['s'])/50.
        dx = uniform(-move, move)
        dy = uniform(-move, move)
        point.SetCoords([x + dx, y + dy])
        self.points.Draw()
        self.mapwindow.Refresh()


def main(giface=None):
    dlg = TestPlugin(giface, parent=None)
    dlg.Show()

if __name__ == '__main__':
    gscript.parser()
    main()

Makefile

MODULE_TOPDIR = ../..

PGM= g.gui.draw

include $(MODULE_TOPDIR)/include/Make/Script.make
include $(MODULE_TOPDIR)/include/Make/Python.make

default: script